Add mypy, ruff, and refurb.

[pre-commit-ci]

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[codecov]

Codecov Report

Merging #51 (b25be9c) into main (7976315) will increase coverage by 2.00%.
The diff coverage is n/a.

❗ Current head b25be9c differs from pull request most recent head 3fdeb64. Consider uploading reports for the commit 3fdeb64 to get more accurate results

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
+ Coverage   46.84%   48.85%   +2.00%     
==========================================
  Files          17       17              
  Lines         587      610      +23     
==========================================
+ Hits          275      298      +23     
  Misses        312      312              

Flag	Coverage Δ
unit	48.85% <ø> (+2.00%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
tests/test_latex_dependency_scanner.py	52.00% <0.00%> (+2.00%)	⬆️
tests/test_config.py	86.66% <0.00%> (+15.23%)	⬆️
src/pytask_latex/config.py	90.47% <0.00%> (+19.04%)	⬆️

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